(29P) Schwassmann-Wachmann
This object has a more recent orbit available here
Object
| Object | (29P) Schwassmann-Wachmann |
| Diameter(1) | 60 km |
| Dynamic class(1) | comet |
| Absolute magnitude | 5.85 |
| G slop | 0.20 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2457754.5 |
| Semi major axis | 6.016546 ± 0.000001 au |
| Eccentricity | 0.041745069 ± 0.000000158 |
| Inclination | 9.375666799 ± 0.000012310 ° |
| Longitude of ascending node | 312.410154 ± 0.000072 ° |
| Argument of perihelia | 48.702170 ± 0.000403 ° |
| Mean anomaly | 305.976080 ± 0.000388 ° |
| Orbital period | 14.76 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 29P_Schwassmann-Wachmann_nima_v2.bsp |
| Date of first observation | 2009-02-17 |
| Date of last observation | 2020-11-19 |
| Number of observations used in the fit | 559 |
| Number of rejected observations | 0 |
| Number of DES observations | 0 |
| Number of MPC observations | 0 |
| Number of unpublished observations | 559 |
| RMS of observations | 0.079 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.149 | 0.053 |
| 2022-07 | 0.145 | 0.041 |
| 2023-01 | 0.232 | 0.068 |
| 2023-07 | 0.189 | 0.068 |
| 2024-01 | 0.290 | 0.133 |
| 2024-07 | 0.229 | 0.111 |
| 2025-01 | 0.325 | 0.187 |
| 2025-07 | 0.268 | 0.153 |
| 2026-01 | 0.350 | 0.206 |
Ephemeris comparison
Difference between NIMAv2 and JPLK192-43 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.